Abstract
This paper aims to investigate the seismic performance of a novel type of steel–concrete hybrid supporting structure consisting of reinforced concrete (RC) tubular columns, steel solid web girder platform, and A-shaped steel frames. It is typically used to house air-cooled condensers (ACC) in thermal power plants (TPPs). First, the finite-element (FE) model was implemented in ABAQUS and the simulation approaches were validated by pseudo-dynamic test results of a scaled steel-concrete hybrid supporting structure. Then, the elasto-plastic time-history analysis of the steel solid web girder-RC tubular column hybrid structure was conducted. The El Centro (NS) record was scaled to peak ground acceleration (PGA) of 0.07, 0.20, 0.40 and 0.62 g to reflect the frequent, basic, rare, and very rare earthquakes. The dynamic characteristics, base shear force, lateral deformation performance, stiffness deterioration, and damage evolution characteristics were analyzed. The numerical results showed that the first vibration mode of this hybrid structure is torsion, due to its small torsional stiffness and the nonuniform distribution characteristics of stiffness and mass in the vertical direction; the lateral deformation shape is shear mode; and the damage mainly occurred on the RC tubular columns, while the steel components did not yield under severe earthquakes. In general, the overall seismic performance of the steel solid web girder-RC tubular column hybrid structural system could meet the seismic design requirements with respect to the high-intensity earthquakes.
Highlights
Steel–concrete hybrid structural systems are obtained through the combination of structural components made of steel, reinforced concrete (RC), and composite steel–concrete
Attention in this study is focused on a peculiar steel–concrete hybrid structure typically applied as the supporting structural system to house air-cooled condensers (ACCs) in thermal power plants (TPPs)
The most popular supporting structural system in TPPs is the steel truss-RC tubular column hybrid structure, which consists of A-shaped steel frames, steel space-truss platform and RC
Summary
Steel–concrete hybrid structural systems are obtained through the combination of structural components made of steel, reinforced concrete (RC), and composite steel–concrete. They are more efficient and economical compared to either traditional steel or RC structures, since they can make full use of the advantages of different materials [1,2,3,4]. A great deal of research on steel–concrete hybrid structures has been carried out in the past, and many high-rise buildings have applied steel–concrete hybrid structural systems [5,6,7]. Attention in this study is focused on a peculiar steel–concrete hybrid structure typically applied as the supporting structural system to house air-cooled condensers (ACCs) in thermal power plants (TPPs). Past research results showed that this kind of structural system is
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